Poor mans grader.
Make a homemade grader from an old set of uniform sized tyres. Set them up in a "A" frame, starting from the front 1, 2, 3, 4 and 5. 5 rows and 5th row with 5 tyres at the rear. Wire them together. I have instructed strip constructors/keepers in Africa to use this. Works a treat but it has it's limitations of course. The ground must be dry enough to support the towing vehicle and soft enough for the earth to move. It will not plane off large ridges. Just keep going up and down the strip for as long as it takes and I have seen and felt some surfaces as smooth as a billiard table after this treatment applied in the correct manner.